Rinnai i120sn boiler pump

dough041

Was about to wire up the boiler pump on a Rinnai i120sn heat only boiler. The circ pumps went through a Taco 3 zone switching relay. Upon opening the cabinet on the Rinnai and locating the boiler pump connection on the control board, unless I'm missing something- I don't see the hot and neutral hook ups labeled on the board. I see the location but the 2 screws arent labeled hot or neutral. Any suggestions?

Alan (California Radiant) Forbes

Wow! Major Boo Boo!

I called Rinnai tech. support [(800)621-9419] and the technician told me that the top terminal is the neutral. This was after a long hold as he went to find the answer, so it's not really evident to anyone, let alone the consumer.

dough041

Thanks  a million...thought it was me. I called rinnai and the rep told me it was "non polarized " which I immediately knew was wrong. Thanks again.

Jamie Hall

Confusion in terminology here. Rinnai is absolutely correct -- AC equipment is non-polarized. however, volt equipment, like those pumps, will have one hot wire and one neutral wire. The difference is that the neutral wire is NOT switched, and the hot wire is.

When the equipment is energized, a voltage checker will show the hot wire as... hot. With 120 volts to ground. The neutral wire will be... neutral, with only a few volts, if any, to ground.

dough041

So I should put the top terminal with the white ( neutral ) and the bottom terminal should be black ( hot ).

EBEBRATT-Ed

@dough041 Yes based on @Alan (California Radiant) Forbes research

dough041

Thank you…